Process of producing a ceramic matrix composite article and article formed thereby

(19)

(11)

EP 1 783 106 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	25.08.2010 Bulletin 2010/34

(43)	Date of publication A2:
	09.05.2007 Bulletin 2007/19

(21)	Application number: 06253297.3

(22)	Date of filing: 26.06.2006

(51)

International Patent Classification (IPC):

C04B 35/80^(2006.01)
B32B 18/00^(2006.01)
C04B 41/87^(2006.01)

C04B 35/573^(2006.01)
C04B 41/50^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

(30)

Priority:

25.10.2005 US 163618

(71)	Applicant: GENERAL ELECTRIC COMPANY
	Schenectady, NY 12345 (US)

(72)	Inventors:
	Corman, Gregory Scott New York 12019 (US) McGuigan, Henry Charles New York 12056 (US) Brun, Milivoj Konstantin New York 12019 (US)

(74)	Representative: Bedford, Grant Richard
	Global Patent Operation - Europe GE International Inc. 15 John Adam Street London WC2N 6LU London WC2N 6LU (GB)

(54)	Process of producing a ceramic matrix composite article and article formed thereby

(57) A CMC article (18) and process for producing the article (18) to have a layer (22) on its surface that protects a reinforcement material (15) within the article (18) from damage. The method entails providing a body containing a ceramic reinforcement material (15) in a matrix material that contains a precursor of a ceramic matrix material (16). A fraction of the reinforcement material (15) is present and possibly exposed at a surface of the body. The body surface is then provided with a surface layer formed of a slurry containing a particulate material but lacking the reinforcement material (15) of the body. The body and surface layer are heated to form the article (18) by converting the precursor within the body to form the ceramic matrix material (16) in which the reinforcement material (15) is contained, and by converting the surface layer to form the protective layer (22) that covers any fraction of the reinforcement material (15) exposed at the body surface.

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